CN105759489B - Curing system and preparation method of near-infrared polymer network liquid crystal phase modulator - Google Patents
Curing system and preparation method of near-infrared polymer network liquid crystal phase modulator Download PDFInfo
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- CN105759489B CN105759489B CN201610302379.0A CN201610302379A CN105759489B CN 105759489 B CN105759489 B CN 105759489B CN 201610302379 A CN201610302379 A CN 201610302379A CN 105759489 B CN105759489 B CN 105759489B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F1/13345—Network or three-dimensional gels
Abstract
The invention discloses a curing system and a preparation method of a near-infrared polymer network liquid crystal phase modulator, which comprises the following steps: curing light source, curing device: decomposing a curing light source and carrying out spatial homogenization on a polymer network liquid crystal phase modulator to be cured; liquid crystal cell: the material for containing and manufacturing the near-infrared polymer network liquid crystal phase modulator is cured under the action of a curing device to form the near-infrared polymer network liquid crystal phase modulator. The invention controls the appearance of the polymer network in the polymer network liquid crystal by using the monochromatic light source generated by the curing light source, utilizes the stability of the monochromatic light source, eliminates the influence of light scattering of the monochromatic light source and realizes pure phase modulation, thereby improving the stability of the near-infrared polymer network liquid crystal phase modulator, improving the electric control response stability of the near-infrared polymer network liquid crystal phase modulator, reducing the threshold voltage of the near-infrared polymer network liquid crystal phase modulator, and expanding the application range and depth of the existing liquid crystal phase modulation technology in the fields of adaptive optics, optical phased array, multispectral imaging technology and the like.
Description
Technical Field
The invention relates to the technical field of liquid crystal phase modulation, in particular to a curing system of a near-infrared polymer network liquid crystal phase modulator and a preparation method thereof.
Background
The liquid crystal phase modulation technology can be used in the fields of liquid crystal spatial light modulators, liquid crystal tunable filter multispectral cameras, liquid crystal optical phased arrays, tunable wave plates and the like, can realize higher spatial resolution and better control precision, and has been widely applied in the fields of adaptive optics, optical phased arrays, multispectral imaging technologies and the like. In practical application, the response speed of the liquid crystal phase modulator in the near infrared region limits the application range and depth of the liquid crystal phase modulator, and the near infrared polymer network liquid crystal phase modulation technology is a technology which is suitable for sub-millisecond response. However, the sub-millisecond response polymer network liquid crystal phase modulator adopting the existing ultraviolet curing system and the common liquid crystal material has the influence of light scattering, threshold voltage, electrostriction and other effects, so that the stability and the practical performance of the sub-millisecond response polymer network liquid crystal phase modulator are poor. The existing ultraviolet curing system mainly has the defects of low curing intensity, serious energy heat dissipation of a curing light source and the like; the material proportion adopted in the existing preparation method is easy to cause the defects of high threshold voltage, electrostriction and the like, so the invention is provided for solving the defects.
Disclosure of Invention
The invention aims to provide a curing system and a preparation method of a near-infrared polymer network liquid crystal phase modulator, which solve the problems of light scattering, threshold voltage, stability and the like of the polymer network liquid crystal phase modulator in the prior art, eliminate the influence of the light scattering on the polymer network liquid crystal phase modulator on the premise of ensuring the sub-millisecond response performance of the near-infrared region of the polymer network liquid crystal, realize pure phase modulation, improve the electric control response stability of the polymer network liquid crystal phase modulator, reduce the threshold voltage of the polymer network liquid crystal phase modulator, and expand the application range and depth of the liquid crystal phase modulation technology in the fields of adaptive optics, optical phased array, multispectral imaging technology and the like.
The purpose of the invention is realized by the following technical scheme:
a system for curing a near-infrared polymer network liquid crystal phase modulator, comprising:
curing a light source: the device is used for generating a monochromatic light source and controlling the appearance of a polymer network in polymer network liquid crystal;
a curing device: decomposing a curing light source and performing space homogenization at a polymer network liquid crystal phase modulator to be cured;
liquid crystal box: the material for containing and manufacturing the near-infrared polymer network liquid crystal phase modulator is cured under the action of a curing device to form the near-infrared polymer network liquid crystal phase modulator.
The invention controls the appearance of the polymer network in the polymer network liquid crystal by using a high-intensity uniform monochromatic light source generated by a curing light source, utilizes the characteristics of lower heat dissipation and high curing intensity of the light source, eliminates the influence of light scattering of the light source and realizes pure phase modulation, thereby improving the stability of the near-infrared polymer network liquid crystal phase modulator, improving the electric control response stability of the near-infrared polymer network liquid crystal phase modulator, reducing the threshold voltage of the near-infrared polymer network liquid crystal phase modulator, and expanding the application range and depth of the existing liquid crystal phase modulation technology in the fields of adaptive optics, optical phased arrays, multispectral imaging technology and the like.
The curing light source adopts a plurality of monochromatic diode laser light sources to form an array. Furthermore, by adopting the mode that a plurality of monochromatic diode laser light sources are arranged to form an array, a high-power-density homogenizing curing light source can be provided for the curing process of the polymer network liquid crystal, which is beneficial to maintaining the anisotropy of the polymer network liquid crystal, eliminating the light scattering intensity and forming the uniform polymer network liquid crystal, thereby realizing the uniform sub-millisecond response near-infrared polymer network liquid crystal phase modulation technology.
The monochromatic diode laser light source is used as a curing light source, and the wavelength of the monochromatic diode laser light source is the geometric mean value of the absorption edge of the liquid crystal solvent and the absorption edge of the photosensitive polymer monomer. Furthermore, a monochromatic diode laser light source is used as a curing light source, the wavelength of the curing light source is the geometric average value of the absorption edge of the liquid crystal solvent and the absorption edge of the photosensitive polymer monomer, the wavelength of the curing light with the wavelength can generate the minimum temperature rise caused by light-induced absorption, and the formation of a uniform anisotropic polymer network is facilitated.
The curing device comprises a micro-lens array and an optical lens, monochromatic light emitted by a curing light source is spatially divided after passing through the micro-lens array, is focused at different positions on a focal plane of the micro-lens array, and then is subjected to spatial homogenization at a polymer network liquid crystal phase modulator to be cured after passing through the optical lens. Furthermore, a micro lens array and an optical lens are combined to form a curing device, the micro lens array is used for diffusing a light source, and then the light source is uniformly mixed by the optical lens, so that the light irradiated on the polymer network liquid crystal phase modulator to be cured is uniform and is homogenized in space.
The preparation method of the near-infrared polymer network liquid crystal phase modulator comprises the following steps:
(a) Preparing materials: the weight percentage is as follows: more than 90% of liquid crystal solvent, 6-8% of photosensitive polymer monomer and the balance of impurities such as photoinitiator;
(b) Filling: loading the material prepared in the step (a) into a liquid crystal box, and manufacturing a polymer network liquid crystal phase modulator to be cured;
(c) And (3) curing: monochromatic light emitted by a curing light source is spatially divided after passing through a micro-lens array, is focused at different positions on a focal plane of the micro-lens array, and then is spatially homogenized at a polymer network liquid crystal phase modulator to be cured after passing through an optical lens.
Another object of the present invention is to provide a novel preparation method, which combines specific formulations and processes, so that the produced sub-millisecond response near-infrared polymer network liquid crystal phase modulator can implement a sub-millisecond response liquid crystal phase modulation technique in a near-infrared region, and eliminate the problems of light scattering intensity, unstable electric control response, high threshold voltage and the like caused by phase modulation of polymer network liquid crystal, thereby facilitating the expansion of the application range and depth of the existing liquid crystal phase modulation technique in the fields of adaptive optics, optical phased array, multispectral imaging technique and the like.
In the step (a), the liquid crystal solvent is required to be: dielectric anisotropy of more than 50 and viscosity of more than 500mms -1 . Specifically, the applicant analyzed tens of thousands of experiments in the development process of the formula, and then found the rule: the large dielectric anisotropy can ensure that the polymer network liquid crystal phase modulator has smaller threshold voltage, the large liquid crystal solvent viscosity can reduce the light scattering intensity of the polymer network liquid crystal, the pure phase modulation is favorably realized, multiple experiments are carried out under the guidance of the rule, the more suitable parameters are finally determined, meanwhile, repeated experiments are also carried out on the component content, the more suitable components are finally determined, the selection standard and the quantity limitation are adopted according to the components, the manufactured pure phase modulation is favorably realized, and the polymer network liquid crystal phase modulator has smaller threshold voltage.
In the step (c) of curing, the method for determining the wavelength of the monochromatic light emitted by the curing light source comprises the following steps: firstly, respectively measuring absorption spectra of a liquid crystal solvent and a photosensitive polymer monomer, determining respective absorption edges, and taking a geometric mean value of the absorption edges of the liquid crystal solvent and the photosensitive polymer monomer as the wavelength of a monochromatic light wave of a curing light source. In particular, such a standard can maximize energy for the curing process of the polymer network liquid crystal, reduce the thermal effect influence in the curing process, and is beneficial to improving the stability of the electric control response of the polymer network liquid crystal phase modulator.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a curing system and a preparation method of a near-infrared polymer network liquid crystal phase modulator.A monochromatic diode laser light source is used as a curing light source, the wavelength of the curing light source is the geometric average value of the absorption edge of a liquid crystal solvent and the absorption edge of a photosensitive polymer monomer, the wavelength of the curing light can generate the minimum temperature rise caused by light-induced absorption, and the formation of a uniform anisotropic polymer network is facilitated;
the invention relates to a curing system and a preparation method of a near-infrared polymer network liquid crystal phase modulator, wherein a curing device is formed by combining a micro lens array and an optical lens, a light source is diffused by using the micro lens array, and then the light source is uniformly mixed by the optical lens, so that the light irradiated on the polymer network liquid crystal phase modulator to be cured is uniform, and is homogenized in space, the curing device can provide a homogenized curing light source with high power density for the curing process of polymer network liquid crystal, and is favorable for maintaining the anisotropy of the polymer network liquid crystal, eliminating the light scattering intensity and forming the uniform polymer network liquid crystal, thereby realizing the uniform sub-millisecond response near-infrared polymer network liquid crystal phase modulation technology;
the curing system and the preparation method of the near-infrared polymer network liquid crystal phase modulator combine through a specific formula and a specific process, so that the produced near-infrared polymer network liquid crystal phase modulator for sub-millisecond response can realize a sub-millisecond response liquid crystal phase modulation technology in a near-infrared region, solve the problems of unstable light scattering intensity, unstable electric control response, high threshold voltage and the like caused by phase modulation of polymer network liquid crystal, and are favorable for expanding the application range and depth of the existing liquid crystal phase modulation technology in the fields of adaptive optics, optical phased arrays, multispectral imaging technology and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic diagram of the wavelength selection of the curing light source in the present invention.
Reference numbers and corresponding part names in the drawings:
2-liquid crystal box, 3-curing device, 4-curing light source, 301-micro lens array, 302-optical lens, and 7-polymer network liquid crystal phase modulator to be cured.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1 to 2, the curing system of the near-infrared polymer network liquid crystal phase modulator of the present invention comprises: and (4) curing light source: the device is used for generating a monochromatic light source and controlling the appearance of a polymer network in polymer network liquid crystal, in the present example, a curing light source 4 adopts a plurality of monochromatic diode laser light sources which are arranged to form a regular hexagon, wherein the monochromatic diode laser light sources are used as the curing light sources, and the wavelength of the curing light sources is the geometric average value of the absorption edge of a liquid crystal solvent and the absorption edge of a photosensitive polymer monomer; the curing device 3 is used for decomposing the curing light source 4 and performing spatial homogenization at the position of the polymer network liquid crystal phase modulator to be cured, wherein the curing device 3 comprises a micro lens array 301 and an optical lens 302, monochromatic light emitted by the curing light source 4 is spatially divided after passing through the micro lens array 301, is focused at different positions on the focal plane of the micro lens array 301, and then is subjected to spatial homogenization at the position of the polymer network liquid crystal phase modulator 7 to be cured after passing through the optical lens 302; liquid crystal cell 2: the material for containing and manufacturing the near-infrared polymer network liquid crystal phase modulator is cured under the action of a curing device to form the near-infrared polymer network liquid crystal phase modulator.
The preparation method of the near-infrared polymer network liquid crystal phase modulator comprises the following steps:
(a) Ingredients: the weight percentage is as follows: the dielectric anisotropy is greater than 50 and the viscosity is greater than 500mms -1 The material is used as a liquid crystal solvent, the liquid crystal solvent is more than 90 percent, the photosensitive polymer monomer is 6 to 8 percent, the rest is impurities, and in the present example, the content of the photosensitive polymer monomer is 7.2 percent;
(b) Filling: filling the material prepared in the step (a) into a liquid crystal box 2, and manufacturing a polymer network liquid crystal phase modulator 7 to be cured;
(c) And (3) curing: firstly, respectively measuring absorption spectra of a liquid crystal solvent and a photosensitive polymer monomer, determining respective absorption edges, taking a geometric mean value of the absorption edges of the liquid crystal solvent and the photosensitive polymer monomer as the wavelength of monochromatic light waves of a curing light source 4, spatially dividing monochromatic light emitted by the curing light source 4 after passing through a micro-lens array 301, focusing the monochromatic light on different positions on a focal plane of the micro-lens array 301, and then performing spatial homogenization on a polymer network liquid crystal phase modulator 7 to be cured after passing through an optical lens 302.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. The preparation method of the near-infrared polymer network liquid crystal phase modulator is characterized in that a curing system based on the near-infrared polymer network liquid crystal phase modulator comprises the following steps:
curing light source (4): the device is used for generating a monochromatic light source and controlling the appearance of a polymer network in polymer network liquid crystal; the curing light source (4) adopts a plurality of monochromatic diode laser light sources which are arranged to form an array, the monochromatic diode laser light sources are used as curing light sources, and the wavelength of the curing light sources is the geometric average value of the absorption edge of the liquid crystal solvent and the absorption edge of the photosensitive polymer monomer;
curing device (3): decomposing the curing light source (4) and performing spatial homogenization at the polymer network liquid crystal phase modulator to be cured; the curing device (3) comprises a micro-lens array (301) and an optical lens (302), monochromatic light emitted by a curing light source (4) is spatially divided after passing through the micro-lens array (301), is focused at different positions on a focal plane of the micro-lens array (301), and then is spatially homogenized at a polymer network liquid crystal phase modulator (7) to be cured after passing through the optical lens (302);
liquid crystal box (2): the material is used for containing and manufacturing the near-infrared polymer network liquid crystal phase modulator, and the curing is completed under the action of a curing device to form the near-infrared polymer network liquid crystal phase modulator;
the preparation method comprises the following steps:
(a) Preparing materials: the weight percentage is as follows: the liquid crystal solvent is more than 90 percent, the photosensitive polymer monomer is 6~8 percent, and the balance is impurities;
(b) Filling: filling the material configured in the step (a) into a liquid crystal box (2) and manufacturing a polymer network liquid crystal phase modulator (7) to be cured;
(c) And (3) curing: monochromatic light emitted by a curing light source (4) is spatially divided after passing through a micro-lens array (301), is focused at different positions on a focal plane of the micro-lens array (301), and then is spatially homogenized at a polymer network liquid crystal phase modulator (7) to be cured after passing through an optical lens (302).
2. The method of claim 1, wherein the method comprises: in the step (a), the liquid crystal solvent is required to be: the dielectric anisotropy is more than 50 and the viscosity is more than 500mms < -1 >.
3. The method of claim 1, wherein the method comprises: in the step (c), during curing, the method for determining the wavelength of the monochromatic light emitted by the curing light source (4) is as follows: firstly, the absorption spectra of the liquid crystal solvent and the photosensitive polymer monomer are respectively measured, respective absorption edges are determined, and the geometric mean value of the absorption edges of the liquid crystal solvent and the photosensitive polymer monomer is used as the wavelength of the monochromatic light wave of the curing light source (4).
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